I was startled that you decided to become engaged to a married woman (and now, later, have been engaged for five years without becoming married). It appears you may just be going on, gee, I like this woman, I'll get engaged to her (I have a friend like that who marries the women right away but now has learned to not bother with getting married, just find a woman and give her a house straight away (the one she'd get in the divorce :-)

You seem to always be on the prowl and not settling down. Why do you think that is? Why are you engaged for 5 years and in a position to be looking around again to notice another woman has broken up with her husband, etc. Find a woman, marry her, and get on with working on a marriage instead of messing with "safe" women who either are already married so not free or are content to be engaged for a zillion years. If you want to marry, do so! If you are having trouble with multiple women, all of them popping up at "odd" times, you have a problem with yourself too and your perceptions of who you are and what you want.